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As Tuesday dawned inhabitants of the world's most polluted city were faced with breathing dangerously toxic air that fell into the "severe" category.

Extremely High Pollution Readings

Several parts of the capital showed an air quality index above 500, which translates to a tenfold increase over the safe limit established by the WHO.

Particular areas, concentrations of PM2.5 and PM10 reached peaks of eighteen hundred, equating to 15 to 20 times exceeding healthy standards.

Fireworks Restrictions and Recent Policy Shifts

Beginning in 2020, officials had implemented a total prohibition on the distribution and bursting of pyrotechnics during Diwali due to their significant contribution to the deadly haze that blankets the city as colder weather sets in.

However earlier this year, the current regional administration approached the highest court to request a relaxation of the ban.

Officials advocated for allowing "environmentally conscious pyrotechnics" – historically criticized by conservation groups as being only approximately one-third lower impact – as a balance between "heritage and environment".

Legal Decision and Implementation

To the disappointment of medical and ecological activists, judges complied with the request, stipulating that eco-friendly pyrotechnics could be set off during limited periods throughout the Diwali.

Throughout the festival evening, there was widespread disregard of the regulated periods across the capital, with little enforcement regarding whether the firecrackers being used were actually the more environmentally friendly version.

Many recording stations throughout the city registered contamination peaking around late evening to the most severe measurements recorded during the festival in at least the past three years.

Cross-Border Effects

Extensive ignition of pyrotechnics during the festival also triggered a dispute with neighbouring the neighboring country, with officials in Pakistani Punjab pointing to deteriorating atmospheric conditions in the city of Lahore on contaminants coming from neighboring India following the events.

Persistent Pollution Problem

Extremely elevated levels of pollution in the city have remained as a serious issue for more than 15 years, with the condition showing no improvement.

Around celebratory seasons, the concentration of toxic particles in the atmosphere has been observed to shoot up to 70% higher the most severe readings ever documented in Beijing, which was previously regarded as the globally most contaminated metropolis.

Diverse Pollution Factors

The problem in the capital is attributed to a mix of various sources including heavy vehicle emissions, dust, development work, rubbish burning and haze from agricultural fires in adjacent states of Punjab and Haryana.

Throughout these areas, agricultural workers regularly burn crop residue to prepare for next season, generating hazardous smog that becomes contained over the metropolitan area as cooler air arrives.

Health and Economic Consequences

Public health and economic impact on the nearly 33 million residents residing in the capital region is enormous, according to multiple studies.

The contaminated air results in high levels of nervous system, heart and circulatory and respiratory diseases, and can potentially cause oncological diseases.

Air quality crisis is estimated to be causing 10,000 premature fatalities annually in the city.